I am new to this forum and look forward to learning from all of you experts. I have been doing bees for about 20 years and still have much to learn. One question that I have is for those of you that you an oxcilic acid vaporizer, I have the Johnny's Ezee Vap; how do you clean the cups? Just finished treating mine and noticed that they are starting to get a residue on them. Thanks so much for your input. Look forward to sharing and learning.